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Project Description

This simple generic cache implementation is Copyright(c) Pilot Systems, 2006-2008 and available under the terms of the GNU GPL v2.

Version information

Version 1.0.2, requires Python 2.4 or higher.

Features

  • fast in memory caching of any object
  • transparent dictionnary-like usage
  • possibility to limit the cache size in number of objects
  • possibility to expire automatically objects after a given time of no update
  • thread-safe

Basic usage

Creating a cache:

>>> from GenericCache.GenericCache import GenericCache
>>> c = GenericCache()

Storing values:

>>> c["key"] = "value"
   or
>>> c.insert("key", "value")

Retrieving values:

>>> c["key"]
   or
>>> c.fetch("key")

None is returned if no value is found in the cache. Fetch can take an optional value to fail with KeyError if no value is found.

Warnings

  • in current implementation keys are converted into strings
  • object expiry for timeout is lazy, which means that objects stay in the cache until someone try to access them, len() will still see them; there is a collect() method to collect all timeouted objects, but it may be slow.

Decorator usage

The decorator, for Python 2.4+, can be used to decorate any function or method. Here is an example:

>>> from GenericCache.GenericCache import GenericCache
>>> from GenericCache.decorators import cached
>>> cache = GenericCache()
>>> @cached(cache)
... def add(x, y):
...     print x, "+", y
...     return x + y
...
>>> add(2,3)
2 + 3
5
>>> add(2,3)
5
>>> add(2,4)
2 + 4
6
>>> add(2,4)
6
>>> add(2,3)
5
>>>

The decorator takes an optional parameter, a marshaller that filter the paramters of the function and converts it into a caching key (some parameters may be discarded, for example).

Release History

Release History

1.0.2

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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1.0.1

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1.0

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

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Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
GenericCache-1.0.2.tar.gz (12.2 kB) Copy SHA256 Checksum SHA256 Source Nov 18, 2009

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